JP2005103445A - Multilayer-coated color steel sheet production method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayer-coated color steel sheet production method and apparatus, wherein while a steel sheet is continuously coated a plurality of times, its surface can be simply and easily inspected, and when defects are detected, information on the defects is reflected on the steel sheet. <P>SOLUTION: A steel sheet is subjected to pretreatment before coating, the steel sheet is subjected to a surface inspection with a plurality of inspection devices set downstream of the pretreatment before coating while the transfer of the steel sheet is tracked. When the inspection results reveal defects on the surface of the steel sheets, the inspection devices judge the types and extents of the defects, and judge the positions of the defects on the steel sheet from the tracking information and output the information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for producing a multilayer coated color steel sheet that inspects the surface of a steel sheet while continuously coating the steel sheet many times and detects defects when the defect is detected.

  In the production of colored steel plates, there are varieties that apply multiple layers of coating to the steel plates, and this multi-layer coating treatment is often continuously performed on the same colored steel plate production line. For this reason, the conventional product surface inspection at the latter stage of the color steel plate production line has been performed only for the surface inspection of the final top coat. In order to inspect defects on the surface of the color steel plate product, a method of inspecting with an optical inspection apparatus that has been widely known has been established and used. For example, Japanese Patent Application Laid-Open No. 8-136474 (Patent Document 1) proposes an optical inspection device that detects coating unevenness, plating unevenness, air bubbles, and the like having a small difference in brightness from normal portions.

When a defect is detected by surface inspection of the final top coat using these methods, the defective portion is cut out and shipped as a product.
JP-A-8-136474

  However, the quality of the color steel sheet includes not only the beauty of the surface appearance of the painted surface but also good workability such as bending and pressing, and the difficulty of peeling, cracking, cracking, etc. of the coating film during processing. Desired. These are often caused by coating defects in the lower layer that are difficult to catch by surface inspection of the final top coat. For this reason, it has been difficult to maintain the product quality, and there has been a problem of the outflow of defective products, that is, complaint products due to the lower layer coating not appearing on the surface.

  In addition, since the surface defects of color steel sheets differ in type and degree, and there are defects that do not necessarily have to be cut, even if there are such surface defects on the color steel sheets under agreement with the customer, It is proposed to ship with the mark.

  The present invention solves the above-mentioned problem, and allows the surface of the steel sheet to be easily and easily inspected while continuously coating the steel sheet many times, and when a defect is detected, the multilayer coated color steel sheet that gives the defect information to the steel sheet. It is to provide a manufacturing method and apparatus.

  The present invention relates to a method for producing a multilayer coated color steel sheet that is coated a plurality of times on the same surface of a steel sheet, and performs a pre-coating process on the steel sheet and tracking the movement of the steel sheet, while downstream from the pre-coating process. The surface of the steel sheet is inspected by a plurality of inspection devices provided on the surface, and when a defect is detected on the surface of the steel sheet from the inspection result, the type and degree of the defect are determined, and from the tracking information This is a method for producing a multilayer coated color steel sheet characterized by determining the position of a defect in the steel sheet and outputting the information.

  Further, the present invention provides a method for producing a multi-layer coated color steel sheet in which a same surface of a steel sheet is coated a plurality of times, and the downstream side of the pre-painting process while performing the pre-coating process of the steel sheet and tracking the movement of the steel sheet. The surface of the steel sheet is inspected by a plurality of inspection devices provided on the side, and when a defect is detected on the surface of the steel plate from the inspection result, the type and degree of the defect are determined, and the marking device A method for producing a multilayer coated color steel sheet, characterized in that a mark capable of identifying the type and degree of the defect is provided at a position corresponding to the defect position of the steel sheet.

  Moreover, this invention is the manufacturing method of the multilayer coating color steel plate in any one of Claim 1 or Claim 2, The surface inspection of the said steel plate is performed after each coating of multilayer coating, The multilayer coating color steel plate characterized by the above-mentioned. It is a manufacturing method.

  Further, the present invention provides a method for producing a multilayer coated color steel sheet according to any one of claims 1 to 3, wherein the type and degree of the determined defect are worse than the predetermined type and degree of the defect. A method for producing a multilayer coated color steel sheet, characterized in that cutting is performed based on the tracking information.

  Further, the present invention provides a multi-layer coated color steel sheet manufacturing apparatus that performs coating a plurality of times on the same surface of a steel sheet, and a plurality of tracking means for tracking the movement of the steel sheet, and a plurality of downstream devices than the pretreatment for coating, When the surface of the steel sheet is detected to have a defect from the inspection means for performing the surface inspection and the inspection information using the inspection means, the type and degree of the defect are determined, and the information obtained from the tracking means And a processing means for determining the position of the defect in the steel sheet and outputting the information based on the position of the steel sheet.

  Furthermore, the present invention provides a manufacturing apparatus for a multi-layer coated color steel sheet that performs coating a plurality of times on the same surface of a steel sheet, and a plurality of tracking means for tracking the movement of the steel sheet, and a plurality of downstream side of the pre-coating treatment, When the surface of the steel sheet is detected to have a defect from the inspection information using the inspection means, the type and degree of the defect is determined, and the information obtained from the tracking means A multi-layer coating color comprising processing means for determining a position of a defect in the steel sheet based on the marking means for providing a mark at a position corresponding to the position of the defect in the steel sheet determined by the processing means It is a manufacturing apparatus of a steel plate.

  According to the present invention, due to defects caused by multi-layer coating during color steel plate manufacturing, good workability such as bending / pressing of color steel plate, and peeling, cracking, cracking, etc. of the coating film during processing are difficult to occur. On the color steel plate production line, it is possible to inspect and detect full-length continuous inspections. Further, by selling defect color information attached to a product color steel sheet, or selling product color steel sheet after discarding a defective part based on the defect information, it is possible to improve product quality and prevent complaints from leaking. Further, the yield can be improved by performing the defect prevention treatment at an early stage based on the defect information during the color steel plate manufacturing.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an example of the apparatus configuration of the present invention, which is an example in the case where two layers of coating treatment are applied to the front surface of a color steel plate. In the figure, 1 is a payoff reel, 2 is a steel plate, 3 is a pretreatment facility, 4 is an entrance side looper, 5 is a single undercoat coating device, 6 is a single undercoat oven furnace, 7 is a single undercoat inspection device, 8 Is a second layer undercoating oven, 9 is a second layer undercoating oven, 10 is a second layer undercoating inspection device, 11 is an exit looper, 12 is a tension reel, 13 is a processing device, 14 is an output device, and 15 is tracking. 16 is a marking device, 17 is a cutting machine, and 18 is a pulse generator.

  The main manufacturing process of the colored steel sheet is as follows. The steel sheet 2 that has been dispensed from the payoff reel 1 and pre-processed by the pre-processing equipment 3 proceeds in the direction of the arrow in the colored steel sheet manufacturing line in FIG. After that, (1) the first undercoat treatment is performed by the first undercoat coating device 5, (2) after being baked and dried in the first undercoat oven furnace 6, (3) the second layer is applied by the second undercoat coating device 8. (4) After being baked and dried in the second-layer topcoating oven furnace 9, it is wound around the tension reel 12 through the exit looper 11. When two or more layers are applied, undercoating and baking drying are added.

  In this invention, the following (5) processes are added between the above-mentioned (2) process and (3) process. That is, after one-layer coating baking oven drying is performed in the one-layer undercoat oven furnace 6, (5) a one-layer undercoat inspection apparatus 7 performs an automatic surface inspection of one-layer undercoat coating. As the optical system of the inspection apparatus, observation with a line sensor camera, a strobe and a normal television camera may be used, or a surface defect meter in a form of scanning a laser beam often used in the cold rolling process may be used. Further, in the case of the optical inspection method, the appearance of the defect differs depending on whether the light from the light source is received by regular reflection or irregular reflection, but any optical system inspection apparatus may be used. Furthermore, an inspection apparatus other than the optical system may be used.

  Then, the inspection result of the first undercoat inspection device 7 is sent to the processing device 13. The tracking information of the steel plate movement is also sent from the tracking device 15 to the processing device 13. The tracking device 15 tracks the movement of the steel plate 2 by counting pulses transmitted from the pulse generator 8.

  When a defect occurs in the first-layer undercoat, the first-layer coating defect information and the defect position information are sent from the processing device 13 to the output device 14 at this time. The output device 14 includes an output device such as a CRT or a printer, and output information is transmitted to an operator. The coating defect information includes the types of defects such as paint bulge and dent, and the size and degree of the defects.

  Next, the following (6) process is added after the above-mentioned (4) process to the exit side looper 11. That is, after the second layer coating baking and drying is performed in the second layer top coating oven furnace 9, (6) the second layer top coating inspection apparatus 10 performs the automatic surface inspection of the second layer top coating. Since the example shown in FIG. 1 is an example in the case of performing two-layer coating treatment, this is the surface inspection of the final topcoat, that is, the surface inspection of the final product. In multi-layer processing of two or more layers, the undercoat process and the undercoat inspection process in the middle stage increase.

  When a defect occurs in the second-layer coating, the second-layer coating defect information and the defect position information are sent to the output device 14 through the processing device 13 at this time as in the first layer, and are transmitted to the operator. . The first layer coating defect information and the second layer coating defect information may be selected from the longitudinal position information, the width direction position information, the defect type information, and the defect rank information from the strip tip, and tracking matching is performed to select a coil defect. An information map is created. The defect information thus obtained is automatically reported to the operator in real time, is automatically recorded, and is managed as coating defect information. The operator can pursue the cause based on the individual defect information, and can take countermeasures at an early stage.

  In addition, the defect information map created in real time by the processing device 13 can be used to mark the defective portion with the marking device 16 or cut the defective portion with the cutting machine 17 online. As a marker in the marking device 16, use of an ink jet pen is conceivable, but other means may be used as long as the mark is attached to the surface of the color steel plate. By changing the marking method and type according to the type and degree of the defect, the user can determine the type and degree of the defect simply by checking the mark attached to the defective part of the coil. it can. When the cutting machine 17 is installed after the exit side looper 11 as shown in FIG. 1, a pulse generator (not shown) is provided on the roll after the exit side looper 11 to correct the tracking information.

  Even if the color steel plate has three or more layers, the automatic inspection of each layer and the utilization of defect information can be performed with the same apparatus and procedure. In addition, when the back surface coating process is performed, it is possible to automatically inspect each layer of the back surface and utilize defect information, as with the front surface.

  As explained above, due to defects that occurred in multi-layer coating during color steel plate manufacturing, workability such as bending and pressing of color steel plates, and peeling, cracking, cracking, etc. of coating films during processing are difficult to occur. On the color steel plate production line, it is possible to inspect and detect full-length continuous inspections. Further, by selling defect color information attached to a product color steel sheet, or selling product color steel sheet after discarding a defective part based on the defect information, it is possible to improve product quality and prevent complaints from leaking. Further, the yield can be improved by performing the defect prevention treatment at an early stage based on the defect information during the color steel plate manufacturing.

It is a figure which shows an example of a manufacturing apparatus structure of a multilayer coating color steel plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pay-off reel 2 Steel plate 3 Pretreatment equipment 4 Entrance side looper 5 Single layer undercoat coating device 6 Single layer undercoat oven furnace 7 Single layer undercoat inspection device 8 Second layer undercoat coating device 9 Second layer undercoat oven furnace 10 Second layer undercoat Inspection device 11 Outlet looper 12 Tension reel 13 Processing device 14 Output device 15 Tracking device 16 Marking device 17 Cutting machine 18 Pulse generator

Claims (6)

In the method of manufacturing a multilayer coated color steel sheet that is applied to the same surface of a steel sheet a plurality of times, the steel sheet is pre-coated, and the movement of the steel sheet is tracked while being provided downstream of the pre-painting process. The surface of the steel sheet is inspected by a plurality of inspection devices, and when the surface of the steel sheet is detected to be defective from the inspection result, the type and degree of the defect are determined, and the defect of the steel sheet is determined from the tracking information. A method for producing a multilayer coated color steel sheet, wherein the position is determined and the information is output. In the method of manufacturing a multilayer coated color steel sheet that is applied to the same surface of a steel sheet a plurality of times, the steel sheet is pre-coated, and the movement of the steel sheet is tracked while being provided downstream of the pre-painting process. The surface of the steel sheet is inspected by a plurality of inspection devices, and when a defect is detected on the surface of the steel plate from the inspection result, the type and degree of the defect are determined, and the defect position of the steel plate is determined by a marking device. A method for producing a multilayer coated color steel sheet, characterized in that a mark capable of identifying the type and degree of the defect is provided at a position corresponding to. 3. The method for manufacturing a multilayer coated color steel sheet according to claim 1, wherein the surface inspection of the steel sheet is performed after each coating of the multilayer coating. In the manufacturing method of the multilayer coating color steel plate in any one of Claims 1 thru | or 3, When the kind and grade of the said defect are worse than the kind and grade of a predetermined defect, it will be in the said tracking information. The manufacturing method of the multilayer coating color steel plate characterized by cutting based on. In a multi-layer coated color steel sheet manufacturing apparatus that performs multiple coatings on the same surface of a steel sheet, a tracking unit that tracks the movement of the steel sheet, and a plurality of devices provided on the downstream side of the pre-coating treatment, perform surface inspection of the steel sheet. When it is detected from the inspection means and inspection information using this inspection means that the surface of the steel sheet has a defect, the type and degree of the defect are determined, and the steel sheet is based on the information obtained from the tracking means. And a processing means for determining the position of the defect and outputting the information. In a multi-layer coated color steel sheet manufacturing apparatus that performs multiple coatings on the same surface of a steel sheet, a tracking unit that tracks the movement of the steel sheet, and a plurality of devices provided on the downstream side of the pre-coating treatment, perform surface inspection of the steel sheet. When it is detected that there is a defect on the surface of the steel sheet from the inspection information using the inspection means and the inspection means, the type and degree of the defect are determined, and based on the information obtained from the tracking means, the steel sheet An apparatus for producing a multilayer coated color steel sheet, comprising: processing means for determining a position of a defect; and marking means for providing a mark at a position corresponding to the position of the defect of the steel sheet determined by the processing means.

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